Stop-motion for cloth-tentering machines.



No. 737,910. PATENTBD SEPT. 1, 1903.

J. L. DABBSi 7 STOP MOTION FOR GLOTH TENTERING MACHINES.

APPLICATION FILED AUG. 30. 1902.

NO MODEL. 2 SHEET I 1.

WITNESSES: IN VENTOH WWW WW A rom/E rs.

No. 737,910. PATENTED SEPT. 1 1903. J. L. DABBS. STOP MOTION FOR CLOTHTENTBRING MACHINES.

APPLIUATIOR FILED AUG. 30, 1902.

N0 MODEL. 2 SHEETS-SHEET 2 i l L W i I i l l l i m VENTOH 7/ L. ,ZZa6Z6A TTOHNE rs.

Uiru STATES Patented September 1, 1903.

ATENT OFFICE.

JOHN L. DABBS, OF ROCKI-IILL, SOUTH CAROLINA, ASSIGNOR OF ONE-HALF TOJOHN R. LONDON, OF ROOKHILL, SOUTH CAROLINA.

STOP-MOTION FOR CLOTH-TENTERING MACHINES.

SEECIFICAIION forming part of Letters Patent No. 737,910, datedSeptember 1, 1903. Application filed August 30, 1902. Serial No.121,596. (No model.)

To all whom, it may concern.-

Beit known that 1, JOHN L. DABBS, residing at Rockhill, in the county ofYork and State of South Carolina, have invented certain new and usefulImprovements in Automatic Stop- Motions for Oloth-Tentering Machines,'of which the following is a specification.

It is well known to the skilled in the art that much trouble and loss oftime and waste IO of cloth is occasioned by the edges of the clothbecoming detached from the tenterchain pins of a cloth-tenteringmachine, and all of which being well understood it becomes necessary forme in the statement of my invention to only refer to the general objectof my invention, which is to provide automatic means of new and improvedconstruction adapted to stop the centering-machine should one or bothedges of the cloth become detached from the tenter-chain pins.

WVith such objects in view I have invented the peculiar stop-motionmechanism which I will now describe in detail, with reference to theaccompanying drawings, forming a per- 2 5 tion of this specification,and in which- Figure 1 is a view showing my improved stop motionmechanism in side elevation. The view also shows with broken-away endsso much of a cloth-tentering machine in side elevation as willillustrate the connection of my invention. Fig. 2 is a top plan view ofthe parts shown in Fig. 1, and Fig. 3 is an enlarged side elevation ofmystop-motion device.

In the view one side-supportin g frame for the 3 5belt-shifter-releasing devices is removed and the shaft and barconnecting the two side frames are shown in cross-section.

As my invention is confined tothe special stop-motion deviceshereinafter described 0 and as the art and also machinery used in Itentering cloth are well understood by the skilled, I have deemed itnecessary to show in my drawings only so much of the tentering-machineas will give a full understanding of my invention. It may be well,however,

to briefly point out enough of the common features of such a machine aswill render my stop -motion devices and their connection with thetentering-machinc .fully understood.

To such end I would say that the letter A in my drawings designates thatportion of a common machine with which my invention is connected. Thesemachines employ two side members 13 B, adapted to be spaced apart and tosupport two endless chains, each having a 5 5 series of pins adapted toengage theselvages of the cloth fed to the machine. The members B B musthave some support, as indicated at B, Figs. 1 and 2. Should the clothbecome detached from these pins itis apparcut that much thereof would beimproperly stretched, and thus rendered defective before said detachmentwould be noticed by the operative. To automatically stop the machinewhen the goods become detached from the tentering-pins,as above stated,I have devised the peculiar mechanism operating to automatically stopfurther operation of the machine so soon as one selvage of the clothbecomes detached from the tenter-chain, which I will describe in detail,as follows:

In carrying out my invention I employ two rollers or wheels O,rotatab1ymounted on the free ends of the arms D D, having pivotal support neareach side member 13. The rol1- ers or wheels 0 are arranged to roll uponthe cloth being stretched, just inside of the tentering-chains anddirectly over levers D I), fixed to a transverse shaft E. To regulatethe pressure of the rollers 0 upon the cloth, the arms D are providedwith adjustable weights F.

G indicates an arm fixed to the shaft E and extending downwardly andhaving pivotedto its lower end one end. of a rod I-I, extending to thetrigger I.

J indicates a rock-arm having pivotal support on the frame K, with itsfree end adapted to engage an adjustable shoulder L on the rod M,extending to either a belt-shifter (not shown) or other power meansoperating the tentering-machine. The trigger I is pivoted to and extendsupwardly from the inner end of the rock-arm J, as shown in Fig. .5.

N indicates a pivoted shoe supported by the frame K and with its freeend extended under a cam-wheel O on the shaft P. The shoe N is held incontact with the cam-wheel O by a spring Q, and the free end of therockarm J is held in engagement with the shouln o der L on the shaft Mby a similar spring R, all as clearly shown in Fig, 3. For reasons aswill appear farther on the cam is continuously rotated while thetentering-machine is in operation by a drive-chain S, (see Figs. 1 and2,) connecting a sprocket-wheel T on the shaft P and a similarsprocket-wheel U, supported by and deriving motion from thecloth-winding beam V. If desired, the drivechain S may extend fromsuitable power means overhead or at some other position.

W indicates a cushion-spring arranged under the levers D, operating tohold the free end of said lever up near or in contact with the underside of the cloth. This spring W may have anysuitable support on theside members'B and is located as best shown in Fig. 3.

X indicates a suitable lever having pivotal support on one of thetentering-machine supports B and shown in Fig. 1. The lever X isintended for drawing backwardly the shifter-rod M to reengage the freeend of the rock-arm J with the shoulder L. It is understood that whenthe free end of the rocker-arm J is in engagement with the shoulder Lthe shifter-rod M must be under tension in direction of arrow. (See Fig.3.)

When the machine is in operation, all the parts of my automatic stoppingmechanism are in position, as best shown in Fig. 3 of my drawings. Nowit is apparent that should the cloth become detached from thetenterchain pins it will draw or sag, as indicated at A in Fig. 2, andthat when this detached edge of the cloth passes under the weightedroller 0 on that side of the machine the roller is free to drop downupon the lever D with weight enough to compress the spring W and throughthe arm G and the rod H draw the trigger I against the free end of theshoe N. It is understood from statements hereinbefore set forth that thecam O is constantly revolving with the shoe N held against it by thespring Q. Now obviously when the cam O rotates the free end of the shoeN will be forced above the upper end of the trigger I. At this instantthe weighted roller C, resting on the lever D through the opening formedby the detached edge of the cloth, as above described, will draw triggerI through the connecting devices under the free end of the shoe N. Uponthe continued rotation of the cam O the free end of the shoe N will bepushed downwardly against the upper end of the trigger I, and thus liftthe forward or opposite end of the rock-arm J out of engage= ment withthe shoulder L on the belt-shifter rod M. The latter being undertension,drawing in direction of the arrow, (see Fig. 3,) it is apparentthat it will move to shift the tentering-machine drive-belt (not shown)or disconnect the source of power of whatsoever nature.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. In combination in a tentering-machine, stop-motion-operating meansresting upon the cloth, a lever located under the cloth with its freeend directly under the said operating means resting upon the cloth, andmeans Worked by the said lever under the cloth operating to stop thetentering-machine by disconnecting its source of power, substantially asdescribed.

2. In combination in a tentering-machine, a pivoted and weighted armresting upon the cloth, a lever arranged under the cloth with its freeend yieldingly held up directly under the free end of the said weightedarm, a rotating cam, a shipper -rod, a rocking arm adapted to hold thesaid shipper-rod against operative movement, connecting means betweenthe said cam and the rocking arm and means extending from the leverunder the cloth adapted in operation, with the other features specified,to free the said shipper-rod, whereby the driving power is disconnectedwith effect to arrest motion of the tenteringmachine, substantially asdescribed.

3. In a tentering-machine and in combination, automatically acting powershifting means consisting of a continuously-rotating cam device, ayielding shoe held in contact with the said cam device, a belt-shifterrod, a yielding rock-arm adapted to hold said beltshifter rod againstmovement, a pivoted trigger on the said rock-arm, adapted to be drawnunder'the said yielding shoe as specified, and connecting meansextending from the said pivoted trigger to operating devices on thetentering-machine whereby, when the cloth becomes detached from thetenter-chain, the saidrock-arm is moved out of contact with thepower-shifter, substantially as described.

JOHN L. DABBS.

\Vitnesses:

OHAs. WV. PEIROE, CHRIS J. BROWN.

